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mlxsw: spectrum_span: Support mirror-to-VLAN 

Offload "tc action mirred mirror" to a device that is a vlan device on
top of a front-panel port device. The hardware encapsulates the mirrored
packets in a VLAN tag. That includes the case that the mirrored traffic
is already VLAN-tagged--in that case the monitor traffic will be
double-tagged, just like in the software path.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2018-05-10 13:13:05 +03:00 committed by David S. Miller
parent 419476624c
commit e00698d1d7
1 changed files with 64 additions and 0 deletions
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64
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
View File

@ -235,6 +235,14 @@ mlxsw_sp_span_entry_bridge(const struct net_device *br_dev,
return dev;
}
static struct net_device *
mlxsw_sp_span_entry_vlan(const struct net_device *vlan_dev,
u16 *p_vid)
{
*p_vid = vlan_dev_vlan_id(vlan_dev);
return vlan_dev_real_dev(vlan_dev);
}
static __maybe_unused int
mlxsw_sp_span_entry_tunnel_parms_common(struct net_device *l3edev,
union mlxsw_sp_l3addr saddr,
@ -477,6 +485,61 @@ struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_gretap6 = {
};
#endif
static bool
mlxsw_sp_span_vlan_can_handle(const struct net_device *dev)
{
return is_vlan_dev(dev) &&
mlxsw_sp_port_dev_check(vlan_dev_real_dev(dev));
}
static int
mlxsw_sp_span_entry_vlan_parms(const struct net_device *to_dev,
struct mlxsw_sp_span_parms *sparmsp)
{
struct net_device *real_dev;
u16 vid;
if (!(to_dev->flags & IFF_UP))
return mlxsw_sp_span_entry_unoffloadable(sparmsp);
real_dev = mlxsw_sp_span_entry_vlan(to_dev, &vid);
sparmsp->dest_port = netdev_priv(real_dev);
sparmsp->vid = vid;
return 0;
}
static int
mlxsw_sp_span_entry_vlan_configure(struct mlxsw_sp_span_entry *span_entry,
struct mlxsw_sp_span_parms sparms)
{
struct mlxsw_sp_port *dest_port = sparms.dest_port;
struct mlxsw_sp *mlxsw_sp = dest_port->mlxsw_sp;
u8 local_port = dest_port->local_port;
char mpat_pl[MLXSW_REG_MPAT_LEN];
int pa_id = span_entry->id;
mlxsw_reg_mpat_pack(mpat_pl, pa_id, local_port, true,
MLXSW_REG_MPAT_SPAN_TYPE_REMOTE_ETH);
mlxsw_reg_mpat_eth_rspan_pack(mpat_pl, sparms.vid);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mpat), mpat_pl);
}
static void
mlxsw_sp_span_entry_vlan_deconfigure(struct mlxsw_sp_span_entry *span_entry)
{
mlxsw_sp_span_entry_deconfigure_common(span_entry,
MLXSW_REG_MPAT_SPAN_TYPE_REMOTE_ETH);
}
static const
struct mlxsw_sp_span_entry_ops mlxsw_sp_span_entry_ops_vlan = {
.can_handle = mlxsw_sp_span_vlan_can_handle,
.parms = mlxsw_sp_span_entry_vlan_parms,
.configure = mlxsw_sp_span_entry_vlan_configure,
.deconfigure = mlxsw_sp_span_entry_vlan_deconfigure,
};
static const
struct mlxsw_sp_span_entry_ops *const mlxsw_sp_span_entry_types[] = {
&mlxsw_sp_span_entry_ops_phys,
@ -486,6 +549,7 @@ struct mlxsw_sp_span_entry_ops *const mlxsw_sp_span_entry_types[] = {
#if IS_ENABLED(CONFIG_IPV6_GRE)
&mlxsw_sp_span_entry_ops_gretap6,
#endif
&mlxsw_sp_span_entry_ops_vlan,
};
static int